i was thinking of piling 3 tyres on top of each other and filling with ericaceaous compost and growing a blueberry bush in there. Does any body know if this is a good idea??

If Magpie wasn't going to put it in the tyres it'd have to go in a pot, so as Paul says, the tyres won't dry out as quick. We didn't know that about having more than one plant tho.
How close do they have to be?

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